420040002440 has 32 divisors (see below), whose sum is σ = 945643167000. Its totient is φ = 167917661184.

The previous prime is 420040002337. The next prime is 420040002461. The reversal of 420040002440 is 44200040024.

It can be written as a sum of positive squares in 4 ways, for example, as 286389803716 + 133650198724 = 535154^2 + 365582^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3003905 + ... + 3140624.

Almost surely, 2^420040002440 is an apocalyptic number.

420040002440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

420040002440 is an abundant number, since it is smaller than the sum of its proper divisors (525603164560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

420040002440 is a wasteful number, since it uses less digits than its factorization.

420040002440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6146249 (or 6146245 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

Adding to 420040002440 its reverse (44200040024), we get a palindrome (464240042464).

The spelling of 420040002440 in words is "four hundred twenty billion, forty million, two thousand, four hundred forty".